Lock nut



.la-n. 22, 1946. `l=' W'ALLCE 2,393,436

LOCK NUT Filed July 3l, 1943 I N MF1/ 28 INVENToR.

v ar 614622066,

accidental means. s

' the blind or Patented Jan. 242, 1946 Loox e Frank C. Wallace, LosAngeles, Calif.,`.assignor to I Herman H; Helbush, Los Angeles, Calif.

'Application' July 31, 1943, serial'No. 496,864

This invention relates to improvements in lock l nuts, having as one ofits primary objects the provision of a lock nut capable of resilientlygrip- ;ping a screw or bolt in a manner to lock the nut against becomingloosened byfvibration or other My inventionjalsov has as an object theprovision of a nut peculiarly adaptable for use in conjunction with ananchor plate to hold the nut in position to be `engaged by a` screw orbolt at hole. Y

Another object of the invention is to provide a novel nut and anchorkassembly wherein the nut may be detachably mounted in the vanchor so asto be replaceable if desired.

My invention has still further advantages'and how those as well as'theabove-enumerated obinaccessible end of arscrewpassing Y Y screw, being-rnade. of a material'Y having ther V,desired resiliency..

jects are achieved will be best understood from the following detailedexplanation of a presently preferred adaptation wherein reference willbe -made to the accompanying drawing, in'which:

Fig. 1 is a perspective of the various component parts disassembled;

, Fig. 2 is a perspective of the parts assembled;

Fig. 3 is a section on line 3-'3 of Fig. 2;

Fig. 4 is a section on line 4--4 of Fig. 2;

Fig. 5 is a top plan View ofthe nut seen in Fig. 4; and Y Fig. 6 is avertical medial section of the shell and its carried nut before the nutis permanently secured in position in the shell. Y

Referring now to the drawing,'I show an anchor plate 5, a shell 6, anutl, and a shell-retaining yoke 8,

PlateY 5 has end anges 9 through which rivet soumis. (01.151-4-21) toreceivey and hold against rotation the onal'portionla of nut l. The nutIy has a radial slot, or, split 270 rextend-l n ing outwardlyy from its'threaded bore.- 2I and: opening through theside wall, and the threaded,

bore2I is of ka diameter slightly less Athan the outside diameter of thescrew V which it receives,i

softhat as thescrew is-threaded. into the. bore,

the' nut is laterallyiexpandedflwithin .the shell.V

Thus thev nut is caused to'resiliently gripVv the The shell 6 isinitially shell is peened over to retain the nut permanently in theshell, the bottom end of the nut resting against the bottom wall 26 ofthe shell.

VTheunder surface of the'end wall 2B of the shell is concaved as shownat 21 and the end wall of the shell has an opening 28 coaxial with theopening H in the sheets as well as coaxial with the bore in the nut, sothat when the device is secured in position on the sheet, as shown inFigs. 3 and 4, the nut is held in position to receive the screw 25. Y

For the purpose of retaining the shell and its carried nut in positionin the anchor plate opening I4 prior to the insertion of the screw, Iprovide a yoke 8 which engages over the flanged portion of the shell andhas iingers 9 converging inholes l0 are provided for the purpose ofsecuring I the plate to a perforated sheet S. Usually the plate issecured over the blind or inaccessible end of a perforation in theVsheet and usually the device is utilized to hold in superposedrelationV a plurality of sheets S. The plate has` oppositely disposedside flanges `I2 whose under surfaces,"

are stepped at I 20LV for theV purpose to be described, and has anhexagonal central opening I4.

In :practice the plate is so disposed with relation tothe sheet uponwhich it is Vmountedthat theope'hing I4 is concentric with thescrew-passing hole H in the sheet or sheets.

The shell 6 has an hexagonal .flange I5. which ts into the opening I4,the side walls of the opening holding the shell against relative rota-ktion, and the inner surface of the shell is likewise hexagonal adjacentits bottom as shown at'll wardly as at 30 at their lower ends to engageunderthe step I2a. of the flanges I2. The yoke has a curved frontextension 9a which is sufijciently pliable to :be bent downwardly aboutthe side of the Shell after being applied whereby to prevent the yokefrom sliding out of its shellretaining position.

In operation, as the screw 25 is threaded into the relatively smallerbore of thenut it expands the nut causing it to resiliently grip thescrew.

The nut shouldnt in the shell with suflicient toleranceto permit thedesired lateral expansion of the nut so that constriction of the nutabout the screw is substantial. -I nd that my lock nut will not workloose under vibration and, in fact, it requires substantial rotativepressure on the screw to remove it from the nut.

While I4 have described my lock nut in conjunc- Y 'tion with an anchormember, it will 'be understood, of course, that the shell and nutassembly may fbe employed apart from the plate 5 and yoke 8, in whichevent the nut would be applied l tothe screw in the usual manner ofapplying nuts, as by a` wrench. In some uses the shell may y n maiewitnit top edge; straight, asshowninFigs. 1 and .6, and after-tha nut 'I isplaced therein the edge portion V6ay of the even be dispensed with,Since its main function is to house the split nut.

It frequently happens that it becomes necessary to replace a nut in suchan anchor and it will lne observed that the shell with carried nut maybe readily removed after the screw is Withdrawn, by lifting the yokeextension 9a and sliding the yoke off the anchor plate.

While, in the foregoing, I have resorted to considerable detail ofstructure and` association of parts in describing a particular exampleof my invention, I wish it to be understood that I have done so merelyto make my invention understood and that I do not limit my invention tosuch details. On the contrary, my invention is only to be limited asappears in the appended claims.

I claim:

1. A device of the class described comprising, in combination, an anchorplate adapted to be secured to a perforated sheet, an opening, intheplate to align with the perforation in the sheet, a cylindric shellhavingA a base ilange portion tting into the opening and" a radially'split nut tting into the, shell, said nut presenting a longitudinalthreaded screw-receiving bore of a diameter less than the diameter ofthe screw whereby the nut is' laterally expansible by virtue of enteringthe screw in theV bore,; and means detachably mounted on the anchorplate and engaging' the shell in a manner to releasably lock the shellin the opening in the plate, said lastnamed; means comprising a yokehaving fingers engageable under the plate, a portion engageable againstthe baseflange of' the shell anda pliable extension engageable againstthe sideof the shell.

2. An anchor for holding a nut having a fiat sided body and an axialthreaded bore, comprising a plate, flange means on the plate fordirectly securing it to a perforated work sheet, said plate having anangular opening therethrough adapted to register with the perforation inthe work sheet, a nut-retaining shell having an angular side surfacetting at its bottom portion in said opening and a screw-passing hole inits bottom in registerA with said bore, said shell having a reduceddiameter annular peripheral portion adj acent its top end, and means fordetachably securing the shell in said opening comprising a yoke memberhaving slidable locking engagement with the plate and said annularperipheral portion of the shell,

3'. Ana-nehor for holdinga'nut having a iiat sided. body and an axialthreaded bore, comprising a plate adapted to be secured to a perforatedwork sheet, said plate having an angular opening therethrough adapted toregister with the perforation in the work sheet and having, a pair of'oppositely disposed, outwardly projecting side anges, a nut-retainingshell having an angular side. surface iitting at its bottom portion insaid opening and a Screw-passing hole in its bottom in register withsaid bore,l said shell' having a reduced diameter annular peripheralportion adjacent its top end, and means for detachably securing theVshell in said opening comprising a yoke member having slidable lockingengagement with said flanges and said annular peripheral portion of theshell.

FRANK C'. WALLACE.

